Sriprom, Pongsert

Preferred name

Sriprom, Pongsert

Alternative Name

Sriprom, P.

Main Affiliation

School of Food Industry

pongsert.sr@kmitl.ac.th

Now showing 1 - 6 of 6

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Preparation of Vegetable Waste-Derived Paper Incorporated with Activated Carbon for Delay Mango Ripening and its Application
(2026-01-01)
Sriprom, Pongsert
;
Thongkham, Phaewa
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Taweesukyingjaroen, Jurairat
;
Somphan, Apiruk
;
Manamoongmongkol, Kanjana
In this study, the vegetable waste-derived paper was developed from vegetable waste-derived fiber and Mahachanok mango seed-derived activated carbon to extend the shelf life of Golden Nam Dok Mai mangoes. Vegetable waste was subjected to alkaline processing using sodium hydroxide to extract plant-based fibers, which were then formed into paper sheets. Activated carbon, derived from Mahachanok mango seeds by carbonization at 450°C and activated by potassium permanganate (KMnO4), was incorporated into the vegetable waste-derived paper to enhance ethylene adsorption efficiency. Three formulations of ripening delay paper were prepared: paper without activated carbon, paper containing 10 g of activated carbon, and paper containing 20 g of activated carbon. The physical properties of the papers were evaluated in terms of tensile strength and water drop absorption. The vegetable waste-derived paper incorporated with 20 g activated carbon showed the highest performance among the developed papers (1.20 ± 0.24 MPa and 0.74 seconds, respectively). Application tests on Golden Nam Dok Mai mangoes showed that the 10 g activated carbon formulation was the most effective in preserving flesh color, maintaining firmness, and balancing total soluble solids (TSS) and titratable acidity (TA), indicating a delayed ripening process. Therefore, ripening delay paper synthesized from vegetable fiber and supplemented with 10 g of activated carbon per 1 kg of fruit was proven to effectively prolong mango shelf life by up to 3 days, demonstrating its potential as a biodegradable solution for postharvest quality preservation.
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Cleaner Bio-Based Plasticizer Synthesis from Waste Cooking Oil to Substitute Toxic Dioctyl Phthalate in PVC film
(2025-01-01)
Chaiyaraksa, Chompoonut
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Sriprom, Pongsert
;
Boonkaen, Fahana
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Laemsri, Arthittaya
;
Smingkaew, Arnita
This research aimed to investigate the possibility of synthesizing a bio-based plasticizer from waste cooking oil using an epoxidation reaction to replace dioctyl phthalate (DOP) in PVC film, which is toxic and hazardous to human health and the environment. This involved synthesizing used household oil through an epoxidation reaction to introduce epoxy groups, followed by isopropyl alcohol to break the epoxy rings and form hydroxyl groups. The chemical structure of the epoxidized waste cooking oil plasticizer was analyzed using Fourier transform infrared spectroscopy (FT-IR), with a focus on confirming the presence of epoxy groups within the 3,500 – 3,000 cm-1 range. Subsequently, this bio-based plasticizer was used in various ratios to DOP to produce PVC films, including ratios of 5:0, 4:1, 3:2, 2:3, 1:4, and 0:5. These PVC films were subject to a comprehensive examination of their physical and chemical properties, including their resistance to tensile stress, elongation ability, the impact on molecular functional groups in the PVC film, and a leaching test. The results showed that the optimal proportion of epoxidized waste cooking oil plasticizer to DOP was 5:0. This ratio demonstrated superior tensile strength, enhanced elongation capacity, increased thermal stability, and exhibited the most robust resistance against solvents compared to other ratios tested.
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Preparation of Activated Carbon from Juvenile Durian Fruit by Activating KMnO4 for Methylene Blue Adsorption
(2026-01-01)
Assawasaengrat, Pornsawan
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Chokelarb, Wasan
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Narkrugsa, Woatthichai
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Sriprom, Pongsert
Preparation of activated carbon from juvenile durian fruit by activation with KMnO4 for methylene blue adsorption was studied. The juvenile durian fruit was pyrolyzed at temperatures of 400, 450, 500, 550, and 600 °C and activated with KMnO4. The results demonstrated that the carbonization at 600 °C yielded the highest iodine number of 298.30 mgiodine/gbiochar. Subsequently, the methylene blue adsorption was investigated using a Box-Behnken designed batch experiment. The experimental design included three variables at three levels: adsorbent dosage (g), initial methylene blue concentration (mg/L), and adsorption time (min). The optimum conditions for methylene blue adsorption efficiency reached approximately 99.9% at an adsorbent dosage of 0.55 g, an initial methylene blue concentration of 10 mg/L, and an adsorption time of 90 min.
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Characterization and Self-Cleaning Properties of Silk Fabric Coated by Chitosan-Xyloglucan/nano-TiO2 Composite Film
(2024-01-01)
Lampang, Chaiyawat Na
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Sriprom, Pongsert
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Manamoongmongkol, Kanjana
;
Assawasaengrat, Pornsawan
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Narkrugsa, Woatthichai
In this study, Chitosan-Xyloglucan encapsulated Titanium dioxide was prepared by in-situ method for coating Silk fabric. FT-IR XRD characterized the functional groups and formation of crystallization of composite film. SEM analysis showed the immobilization of composite film on the surface of silk fabric. The coated silk fabrics were stained with methylene blue, and the stain removal efficiency was evaluated. The results showed that the composite film was deposited onto the silk fabric. The functional groups showed peaks around 1635 to 1636 and 400 to 500 cm-1 that indicate the presence of C=N groups of Chitosan-Xyloglucan and Ti-O groups of TiO<inf>2</inf> on the composite, respectively. The XRD results indicated that the TiO<inf>2</inf> prepared by the sol-gel method was an anatase crystalline structure. The mechanical properties showed the composite film was superior to the Chitosan-Xyloglucan, TiO<inf>2</inf>, and uncoated silk fabric. Finally, the methylene blue degradation capability was investigated. The coated silk fabric has insignificantly removing methylene blue stain than the untreated silk fabric, but it is noticeably repellent to stain.
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Optimizing Decolorization Efficiency of Methylene Blue by Photo-Fenton Process over Fe-Diatomite using Central Composite Design
(2018-01-01)
Sriprom, Pongsert
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Champa, Varocha
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Kitchaiya, Prakob
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Assawasaengrat, Pornsawan
The methylene blue was degraded by photo-fenton over Fe-diatomite prepared by dry impregnation method. The characterizations of catalyst were studied by XRD, XRF and BET surface area. The photo-fenton reaction conditions were studied as parameters of the H<inf>2</inf>O<inf>2</inf> concentration, the amount of Fe-diatomite, the initial concentration of methylene blue and the initial pH of solution, which were designed by central composite design (CCD) based on response surface methodology (RSM) to accomplish the optimal condition. The results showed that the optimum condition was at the initial H<inf>2</inf>O<inf>2</inf> concentration of 116 mg/L, the Fe-diatomite of 1 g/L, the initial MB concentration of 200 mg/L and the pH of 5.8. It could predict the decolorization value of 100% and reduce the total organic carbon (TOC) to 72.3%. Finally, the validation was tested in 5 runs at the optimization about 99.2 ± 0.2% which implied that the regression model is in a good agreement.
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Synthesis of Epoxidized Waste Cooking Oil as Plasticizer in the Production of Xyloglucan-Chitosan Films
(2025-01-01)
Assawasaengrat, Pornsawan
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Kikaew, Kuntida
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Wanliphakha, Warintorn
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Orachorn, Wimolpan
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Chokelarb, Wasan
The synthesis of epoxidized waste cooking oil (EWCO) from used oil and the potential of using EWCO as a plasticizer to replace glycerol in xyloglucan-chitosan film were studied. The epoxidation reaction generated an epoxy group, which was induced to break off and form OH groups, potentially used as EWCO plasticizers (EWCOP). The determination of EWCOP by analyzing the chemical structure using FT-IR, where peaks were observed at 3496 cm<sup>-1</sup> and 827 cm<sup>-1</sup>, indicating the opening of the epoxy group. According to the physical properties test, EWCOP has a total acid number of 9.91 mg KOH/g, a flash point below 50 °C, and a viscosity of 0.79 cST at 40 °C. A xyloglucan-chitosan film was prepared using a concentration ratio of xyloglucan to chitosan of 4:1, mixed with a solution of glycerol and EWCOP as the plasticizer at ratios of 7:0, 5:2, 3:4, and 0:7, representing 35% of the total weight of solids. The tensile strength of the xyloglucan-chitosan film increases with a decrease in the glycerol : EWCOP ratio, offering hope for the potential of EWCOP in future applications. Conversely, an increase in the glycerol: EWCOP ratio reduces the elongation of the xyloglucan-chitosan film. The water vapor transfer rate and T<inf>g</inf> in the xyloglucan-chitosan film are lowest when the glycerol: EWCOP ratio is 3:4 and 0:7, respectively. The results showed that using EWCOP as plasticizers to replace glycerol significantly enhanced many aspects of synthesized xyloglucan-chitosan film properties, demonstrating the potential of this research to make a substantial impact in the field.

Sriprom, Pongsert

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